Globular Cluster M28
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| Globular Cluster M28 (also known as Messier Object 28 or NGC 6626) is a globular cluster in the constellation Sagittarius. It was discovered by Charles Messier in 1764. M28 is at a distance of about 18,000 to 19,000 light-years away from Earth. 18 RR Lyrae type variable stars have been observed in this cluster. In 1987, M28 became the second globular cluster where a millisecond pulsar was discovered (the first was Globular Cluster M4). External links
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